Windows XP Professional with all themes removed except for the old Windows 95 theme on everything. All computers automatically reset (almost) everything on startup and are set up with some domain server run by the government from which they download everything about user accounts. They also have to set up every single thing on login (automatic process, though), which takes a really long time.
I just bring my own laptop to school and use that instead anyway, so none of those problems matter to me.